7.3 Startup Lope

[EdBoy9573]

Ive owned my 95 7.3 for 6 months now. It was stock when I bought it and since the day it came home it always had a miss when i started it. It lasts for 5-10 seconds and clears out and the thing runs like a champ. It does it weather it is cold or warm. I can drive around all day pull into 7-11 grab a soda come back out and it will still have the miss to it. My friend and I think this is being caused by either bad injectors or a bad HPOP. Any opinions would be great!!

[adfields]

I would be more likely to think fuel pressure low at startup. You could check that with a gage at the valve on the filter housing. It should stay above 40 psi when ruining from what I have read. Mine holds pressure for some time even after it is shut off. It can be off for a week and if I push on that little valve core will spirits fuel out under pressure.

[adfields]

Sorry, I forgot!

[AFBLUE]

I 2nd the motion to check your fuel pressure when its not running, if you are bleeding fuel pressure off, look at the condition of your Fuel pressure Regulator spring and poppet, from there it could be a leaking injector that is leaking down when you shut the truck off.

If it makes you feel any better, my truck does it in the morning when I start it up. I get a "rump rump rump" at 500 rpm, then it smooths out and idles fine.

[EdBoy9573]

Cool thanks alot guys. We'll be looking more into it when we finish up my buddies project truck.